add action recognition solution, remove related example

[fcakyon]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Introduction of action recognition documentation and functionality using YOLOv8.

📊 Key Changes

• Added a new guide and reference documentation for action recognition with YOLOv8.
• Introduced ActionRecognition class to implement real-time action recognition.
• Removed example scripts in favor of integrated documentation.

🎯 Purpose & Impact

• Purpose: To enable users to detect and classify actions in video streams, enhancing applications like surveillance and sports analysis.
• Impact: Provides users with the capability to easily implement action recognition, improving their projects' analytics and monitoring features.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0.46512% with 214 lines in your changes missing coverage. Please review.

Project coverage is 68.99%. Comparing base (fceaa40) to head (06f6df2). Report is 648 commits behind head on main.

Files with missing lines	Patch %	Lines
ultralytics/solutions/action_recognition.py	0.00%	204 Missing :warning:
ultralytics/utils/__init__.py	9.09%	10 Missing :warning:

:exclamation: There is a different number of reports uploaded between BASE (fceaa40) and HEAD (06f6df2). Click for more details.

HEAD has 8 uploads less than BASE

Flag	BASE (fceaa40)	HEAD (06f6df2)
GPU	2	1
Tests	8	4
Benchmarks	6	3

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16441      +/-   ##
==========================================
- Coverage   76.08%   68.99%   -7.09%     
==========================================
  Files         129      130       +1     
  Lines       17091    17306     +215     
==========================================
- Hits        13003    11941    -1062     
- Misses       4088     5365    +1277     

Flag	Coverage Δ
Benchmarks	34.05% <0.46%> (-0.43%)	:arrow_down:
GPU	35.68% <0.46%> (-3.11%)	:arrow_down:
Tests	65.49% <0.46%> (-6.91%)	:arrow_down:

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[github-actions[bot]]

👋 Hello there! We wanted to let you know that we've decided to close this pull request due to inactivity. We appreciate the effort you put into contributing to our project, but unfortunately, not all contributions are suitable or aligned with our product roadmap.

We hope you understand our decision, and please don't let it discourage you from contributing to open source projects in the future. We value all of our community members and their contributions, and we encourage you to keep exploring new projects and ways to get involved.

For additional resources and information, please see the links below:

• Docs: https://docs.ultralytics.com
• HUB: https://hub.ultralytics.com
• Community: https://community.ultralytics.com

Thank you for your contributions to YOLO 🚀 and Vision AI ⭐